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Figure 3.9. Binary diagrams showing chondrite normalized REE compositions of different
generation of uraninite A. Plot of (Yb) N vs (La/Yb) N , B. Plot of ΣREE vs LREE, C. Plot of
(La/Sm) N vs (La/Yb) N , D. Plot of ΣREE vs LREE/HREE.
The average total REE concentration in mafic dikes in the Martin Lake Basin is low
(ΣREE=378 ppm, Tables 3.7 and 3.8; Figs. 3.9B and 3.9D), with a pronounced LREE
enrichment (La N /Yb N =33.6) and slight negative Ce (Ce/Ce*=0.9) and Eu (Eu/Eu*=0.8)
anomalies (Fig. 3.10G). The U 5 uraninite from the volcanic-type has low REE contents
(ΣREE=4158 ppm) (Tables 3.7 and 3.8; Figs. 3.9B and 3.D) with pronounced LREE
enrichment (La N /Yb N =28.2) and negative Ce (Ce/Ce*=0.7) and Eu (Eu/Eu*=0.7)
anomalies (Table 3.7, Figs 10E and 10F). Chondrite-normalized REE patterns have a high
LREE/HREE ratio of 18, which is similar to patterns in mafic dikes (Fig. 3.10G).
Chondrite-normalized (La/Sm) N and (Tb/Yb) N and the ratio LREE/HREE are similar in
both mafic dikes and U 5 uraninite (Table 3.7), suggesting a genetic relationship.
Mineralisation Type n ΣREE ΣLREE ΣHREE LREE/HREE Eu/Eu* (La/Yb)N (La/Sm)N (Tb/Yb)N (Yb)N
Metasomatic 3 17834 2162 1653 7.2 0.1 19.5 5.0 1.6 192.2
Early Tensional vein 5 2386 2162 125 11.1 0.6 14.3 7.4 1.1 16.8
Breccia-type 12 15848 12021 2493 4.5 0.7 4.2 2.0 1.3 372.2
Volcanic-type 14 4158 3897 267 16.6 0.7 25.9 12.6 1.2 23.5
Mafic dyke 10 378 359 19 18.6 0.8 33.6 4.7 2.1 1.7
Athabasca-type 7 9497 8882 479 16.0 0.6 11.4 3.5 1.4 70.2
Table 3.7: Characteristic of REE compositions uraninite for different generations of U
mineralization in the Beaverlodge area. (LREE/HREE)=chondrite-normalized
(La+Ce+Nd)/(Dy+Er+Yb); Eu*=theoretical value for no chondrite-normalized anomaly. n=
number of analyses.
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